GB1412268A - Electroluminescent devices - Google Patents

Electroluminescent devices

Info

Publication number
GB1412268A
GB1412268A GB5485372A GB5485372A GB1412268A GB 1412268 A GB1412268 A GB 1412268A GB 5485372 A GB5485372 A GB 5485372A GB 5485372 A GB5485372 A GB 5485372A GB 1412268 A GB1412268 A GB 1412268A
Authority
GB
United Kingdom
Prior art keywords
pulses
brightness
forming voltage
high resistivity
applying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5485372A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB5485372A priority Critical patent/GB1412268A/en
Priority to DE2259525A priority patent/DE2259525C2/en
Priority to JP12238372A priority patent/JPS5651355B2/ja
Priority to US362705A priority patent/US3869646A/en
Publication of GB1412268A publication Critical patent/GB1412268A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

1412268 Electroluminescence DEFENCE SECRETARY OF STATE FOR 31 Aug 1973 [28 Nov 1972] 54853/72 Heading C4S A device comprises e.1. material having a high resistivity region produced by applying a forming voltage across the material and means for applying unidirectional pulses with a height greater than the maximum forming voltage and a pulse length such that the brightness B # #B M Î B DC where B M and B Dc are maximum brightness and brightness with 5 millisecond pulses respectively. The use of such pulses lengthens active live and increases contrast between lit and unlit areas. The e.l. material comprises ZnS : Mn particles coated with Cu embedded in a binder or a thin phosphor film vapour deposited on a glass substrate. To produce the region of high resistivity near the anode a potential of 25 V is applied for 2-3 minutes when the phosphor becomes weakly emitting. A steadily increasing voltage is then applied at constant power. Alternatively the forming voltage may be pulsed. A continuous layer or elements of the e.l. material are placed between crossed conductor arrays to form a display panel which is operated in the line scan mode. Pulses are applied using circuits each comprising a pair of transistors and a diode or a transistor and capacitor.
GB5485372A 1972-11-28 1972-11-28 Electroluminescent devices Expired GB1412268A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB5485372A GB1412268A (en) 1972-11-28 1972-11-28 Electroluminescent devices
DE2259525A DE2259525C2 (en) 1972-11-28 1972-12-05 Electroluminescent device
JP12238372A JPS5651355B2 (en) 1972-11-28 1972-12-06
US362705A US3869646A (en) 1972-11-28 1973-05-22 Electroluminescent devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5485372A GB1412268A (en) 1972-11-28 1972-11-28 Electroluminescent devices

Publications (1)

Publication Number Publication Date
GB1412268A true GB1412268A (en) 1975-10-29

Family

ID=10472261

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5485372A Expired GB1412268A (en) 1972-11-28 1972-11-28 Electroluminescent devices

Country Status (4)

Country Link
US (1) US3869646A (en)
JP (1) JPS5651355B2 (en)
DE (1) DE2259525C2 (en)
GB (1) GB1412268A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1522520A (en) * 1976-01-26 1978-08-23 Secr Defence Display panel constructions
US4266223A (en) * 1978-12-08 1981-05-05 W. H. Brady Co. Thin panel display
US4275336A (en) * 1979-03-05 1981-06-23 International Business Machines Corporation Method of improving the memory effect and brightness of an alternating current excited thin film electroluminscent device
US4826727A (en) * 1985-07-03 1989-05-02 The Cherry Corporation Phosphorescent material for electroluminescent display, comprising silver sulfide in copper sulfide coating on phosphor particles and/or elemental sulfur in dielectric binder for phosphor particles
US4839563A (en) * 1987-05-28 1989-06-13 Gte Products Corporation Pulse burst panel drive for electroluminescent displays
JPS6439498U (en) * 1987-09-04 1989-03-09
US5206749A (en) * 1990-12-31 1993-04-27 Kopin Corporation Liquid crystal display having essentially single crystal transistors pixels and driving circuits
US5751261A (en) * 1990-12-31 1998-05-12 Kopin Corporation Control system for display panels
US5475514A (en) 1990-12-31 1995-12-12 Kopin Corporation Transferred single crystal arrayed devices including a light shield for projection displays
US5661371A (en) * 1990-12-31 1997-08-26 Kopin Corporation Color filter system for light emitting display panels
US5444557A (en) * 1990-12-31 1995-08-22 Kopin Corporation Single crystal silicon arrayed devices for projection displays
DE29512835U1 (en) * 1995-08-09 1996-12-05 Gez Ges Elekt Zugausruest Lighting device
US6069597A (en) * 1997-08-29 2000-05-30 Candescent Technologies Corporation Circuit and method for controlling the brightness of an FED device
US6724149B2 (en) * 1999-02-24 2004-04-20 Sanyo Electric Co., Ltd. Emissive display device and electroluminescence display device with uniform luminance
WO2008020396A1 (en) * 2006-08-14 2008-02-21 Philips Intellectual Property & Standards Gmbh Electroluminescent device having a variable color point

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947718C (en) * 1953-10-07 1956-08-23 Philips Nv Device for generating electroluminescence
US2972692A (en) * 1958-05-02 1961-02-21 Westinghouse Electric Corp Method for operating electroluminescent cell and electroluminescent apparatus
US2972694A (en) * 1959-08-12 1961-02-21 Westinghouse Electric Corp Method of operating electroluminescent cell
US3185893A (en) * 1960-12-30 1965-05-25 Honeywell Inc Control apparatus for restoration of brightness in electroluminescent cells
US3519880A (en) * 1966-12-29 1970-07-07 Matsushita Electric Ind Co Ltd Electroluminescent image display system having improved horizontal scanning
US3525547A (en) * 1968-07-16 1970-08-25 Deere & Co Grapple
GB1300548A (en) * 1969-01-28 1972-12-20 Mini Of Technology Improvements in or relating to electroluminescent devices
US3708708A (en) * 1971-01-22 1973-01-02 Prudential Insurance Co Treatment of light emitting films to extend their useful life

Also Published As

Publication number Publication date
JPS5651355B2 (en) 1981-12-04
DE2259525A1 (en) 1974-05-30
US3869646A (en) 1975-03-04
JPS4984592A (en) 1974-08-14
DE2259525C2 (en) 1986-06-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19930830